Xcode editor area not working right

Question

I've been having this weird bug where when I click on some implementation files in Xcode, the editor area will freeze up and not let me move the cursor or scroll and sometimes flashes blank. The only way I've been able to edit it is to copy and paste into text editor. I've tried deleting all derived data but that did not help. Any suggestions? I'm running Xcode 4.6.2

Answer 1

I have the same issue and it almost drove me to insanity!

By chance I discovered that this bug seems to be caused by the placeholders of XCode's code completion.

The workaround: open the "offending" file in another editor and remove the placeholders, which are displayed as <#placeholder#>.
This has solved the problem for me… but it doesn't change the fact that this is a nasty bug.

I'm using XCode 4.6.3 btw.